Latch.



A. C. O. BOCK.

LATCH.

APPLICATION FILED III/III. II, 1915.

LR @991 II Patented May 30, 1916.

2 SHEETS-SHEET l.

U n i NI/ENTOR d .A m

A. C. 0. BOCK.

LATCH.

APPLICATION FILED MAR. I1, Isls.

LIMMLQ. Patented May 30,1916.

WITNESS/5S NVENTO? till Ormea.

ALFRED C. O. BOCK, OF BROOKLYN, NEW YORK, ASSIGNOR TO THE YALE @n TOWNEMANUFACTURING COMPANY, 0F STANFORD, CONNECTICUT. f

LATCH.

Specification of Letters Patent.

Patented May 30, 191156.

applicati@ mea March 11, 1915. serial No. 13,631.

To all 'whom itmay concern:

Be it known that ll, ALFRED C. O. BOOK, a subject of the Emperor ofGermany, and a resident of Brooklyn, in the county of Kings end State ofNew York, have invented cer- Ian new and useful Improvements in L:tches; and ll do hereby declare the following to be a full, clear, andexact descrip-` tion of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same. Myinvention relates toA an improvement in latches, and more particularlyto that type in which the bolt becomes automatically dead locked whenthe door to` which the latch is attached is closed.

rlhe inventlon consists ma latch in which the bolt is retracted by a keyor a knob,

and is held retracted by means which move the bolt laterally intocontact with holding means, and which will give or yield when the boltmakes contact with the strike plate of the lock, thus releasing the boltand permitting it to move into deadlocking posi tion within the keeper.

My invention further consists in the parts and combinations of parts aswill be more fully explained and pointed out in the claims.

lin the accompanying drawings, Figure 1 is a view of the lock inoperative position on a door, a portion of the lock casing being removedto show the operative parts of the lock; Fig. 2 is a view inlongitudinal cross section through a door, lock and keeper, showing thedoor just before the bolt makes contact with the strike plate of thekeeper; Fig. 3'is a similar view showing the door closed and the boltprojectedinto the keeper; Fig. 4 is a view of the lock, the removablecover plate being removed and showing the bolt projected and deadlockedand Fig. 5 is a similar view showing the bolt retracted.

1 represents a door, 2 the door vframe and 3 the latch or lock casingsecured to the door and carrying a bolt 4, adapted to engage the keeper5 secured to the frame 2. The bolt 4 is provided with a shank'whichrests and slides against the inner face of the lockl casing, and whichis bifurcated so as to shank, so that when the dead locking lever hasrbeen moved to release the bolt, the cam will contact with the shoulder12, so that a continued rotation of the c'am will then retract the bolt.

The dead locking lever 11 is pivotally'secured to the bolt shank by thepin 13, and 1s provided with shoulders 14 and 14a adapt- .ed when thebolt is projected, to engage the opposite faces of post 6 and positivelyhold .the bolt .against longitudinal movement in either direction, or inother words positively deadlock the bolt. The dead locking lever isyieldingly held in contact with the' post by a spring 15, and the boltis projected by the spring 16 secured at one end to the lock casing andat its other end to the bolt shank. rlhe bolt is provided on its outeror front face near its free end with a groove 17 extending 4throughoutthe Width of the bolt parallel with the end of the lock casing. Thisgroove is slightly wider than the thickness of the end wall of the lockcasing, so that in retracting the bolt,when the groove 17 is oppositethe said end wall of the casing, the bolt will be moved or tiltedforwardly thus forcing the grooved bolt is e'ected by the flat spring18, secured to the lock casing and bearing against the rear face of thebolt and constantly tending to force the grooved face of the boltagainst the adjacent edge of the end wall of the casing through whichthe bolt passes. The bolt when thus retracted, is held simply by theengagement of the end wall of the casing with the groove in the bolt, sothat when the bolt is shifted rearwardly, the groove in the bolt passesoff the end wall of the lock casing thus leaving the bolt free to beprojected by its spring. rIhe front face of the outer or free end of thebolt, projects slightly beyond the edge of the door so as to engage thestrike plate 19 of the keeper 5 as the door nishes its closingmoveeenlll@

ment, so that when the bolt is retracted the closing of the door effectsthe release of the. bolt which then shoots into the keeper and.

locks the door.

By this constructlon I dispense w1th a separate mechanism for holdlngthe bolt retracted and for releasing the bolt, thus ma.l

terially simplifyin the construction, lessening the number o parts, andreducing the cost 'of manufacture.

While, I have shown and referred to a groove in the face of the bolt, itis clearly evident that a shoulder to engage a fixed stop on the latchcasing or other part would be the equivalent -of the groove, the rearwall of the groove acts simply as a shoulder, and the bolt would operateif the face of the bolt in front of said shoulder were cut away.

Having fully described my invention what I claim as new and desire tosecure by Letters-Patent, is

1. In a latch, the combination of a casing, a bolt having a shoulder onone face and passing through an end wall of the casing, the free end ofthe bolt adapted to project beyond the side edge of the'door when thebolt is retracted, means for retracting the bolt, a spring forprojecting it, means for deadlocking the bolt when the latter isprojected, and a spring for forcing the shouldered face of the boltagainst the end wall of the casing whereby the en agement of saidshoulder with the end wal of the casing will hold the bolt retracted.

2. In a latch, the combination of a casing, a bolt having a groove inits front face land passing throu h an end wall of the outer projectingend of the bolt for moving it rearwardly to disengage the end wall andgroove and a keeper for housing the end of the bolt when the latter isprojected.

In testimony whereof, I have signed this specification in the presenceof two subscribing witnesses.

ALFRED C. O. BOCK.

Witnesses:

FRED C. SQUIRES, R. P. REsoH.

